Mounting and driving means for cutters



Aug. l0, 1937. c. G. OLSON MOUNTING AND DRIVING MEANS FOR CUTTERS Filed Sept. 29, 1933 OLSON ATT'YS.

' INVENTOR= CARL. G.

Patented Aug. 10, 1937 UNITED STATES Carl G. Olson, Chicago, Ill., assignorto PATENT OFFICE minou Tool Works, Chicago, lll., a corporation of Il- Applicaties september ze, 193s, Nessus:

5Claims.

This invention relates generally to mountings and driving means for cutters, and more particularly to improvements in means for supporting a cutter on a tool driving arbor.

5 Considerable difficulty has been experienced in the past in connection with the mounting of cutters, for example, bobbing cutters, thread milling cutters, and form cutters in general upon machine arbors. Obviously such cutters will l generate or reproduce their form only when mounted to run perfectly true about the axis on which they were rotated when made in the shop. That is to say, such cutters will .generate or rc produce their form accurately provided that, when 1J they are mounted upon a machine, they rotate perfectly true about a given axis, and this axis must be coincident with the axis about which the cutter blanks were rotated when the teeth were produced thereon. In practicing conventional 20 methods of procedure, it requires that the arbors on which the cutters are to be used, must be perfect in size, and that the holes in all cutters to be used on such arbors are all alike and have a perfect fit on the arbor, and, further, that the 25 holes have exactly the same and correct diameter at both ends. When it is understood that the dimensions referred to above are measured in fractions of thousandths of an inch, it will be apparent that this procedure in the 'shop be- 30 comes a very tedious accomplishment and introduces an element of expense in the production of tools. The matter of increase in the expense of production will be more fully appreciated when it is understood that if the holes in the cutters 35 become oversize in the process of making them, there is no practical method of remedying this condition, except by making a new cutter. This diiilculty has been the cause for considerable scrap in the cutter shop, and frequently becomes .40 costly.

The primary object of the present invention is to overcome the above mentioned and other'dimculties heretofore experienced, and to this end I 45Vrangement for cutters, one embodiment ofwhich includes the provision of conical surfaces on a rotary body, which coact with companion conical surfaces on the arbor structure or support to thereby facilitate the accurate mounting of a 50 cutter.

More speciiically, my invention contemplates the provision of a device including an arbor having aplurality of axially extending locking elements, which interlock with companion elements provided along the inner peripheryof a rotary very body in combination with means in the form of conical supporting surfaces adapted to receive companion conicalsurfaces provided at opposite extremities of said rotary body.

Still more specifically, my invention contem. plates the provision of a cutter support designed to receive bearing-surfaces provided along protuberances extending axially from each'end of a rotary body.

A further and more specific object of the invntion is to provide a device, as above set forth, wherein a pair of companion sleeve members positioned at one side of a rotary body cooperate with a pair of companion sleevemembers at the opposite side of said body to support a cutter structure by engaging annular surfaces accurately positioned at each end of the body.

Ihe foregoing and numerous other objects and advantages will be more apparent from the following detailed description when considered in connection `with the accompanying drawing, wherein- Figure 1 is a central iongitudinalvsecuonai view' of a supportingvdevice of my improved construction disclosed in operative association with a cutter body, the arbor proper being shown in elevation;

Figure 2 is a transverse sectional view taken along the line 2-,2 of Figure l; i y

vFigure .3 is ay transverse sectional view taken along the line 3-3 of Figure 1;,

Figure 4 discloses a"fragmentary portion in section of' a modified recess arrangement for the body; and

Figure 5 is a further modification of the `recessedbody. Referring now to the drawing more in detail wherein like numeralshave been employed to designate similar parts throughoutthe ,various4 .figures it be seen that one embodiment of my invention includes an'arbor lil, which extends from a suitable arbor support I2, Thefree end ofthe arbor Illis reduced and threaded to receive a suitable clamping nut i4,` and a plurality'of equally spaced keyways IB (three in number as shown) extend longitudinallyA of said arbor. Thesekeyways I6 are adapted to interlock with complementary keys I8 provided along and extending inwardly from a rotary body 20.

In thepresent embodiment, the body 2li forms an integral part ofv a milling cutter, which I have designated generally by ,the numeral 22, and this cutter includes a plurality `of teeth`2 formed integral with the body 2li. Obviously the rotary body may be formed independently of the cutter portion `fp rop'er, and hence .the .present lnvention `does 4not 'contemplate any particular cutter-.tooth structure, but does include the zcombinationof a rotary-body, such as'the cutterbody 5 20 shown herein with cooperating elements .for

accurately maintaining .said rotary body in Aposition. Extending axially from each end of the rotary body 20 is'an annular protubrance..26, whichils substantially 2V-shaped intcrossesecti'on l so asto present inner and outer conical bearing surfaces 26a and 2Gb, respectively. These bearing surfacesgZSa andlb providedonthe arinular protuberance orhub `2.6 aregroundso as l,

to receive complementary ground surfaces V28a l and '28h .formed at theinnery-'ends of concentric l sleeves `:wand f3.2, respectively. I Y The sleeves 2:30 yare accurately and slidably fitted ion the arbor 1.0, and-,each of the sleeves 32 is kaccurately and slidably .fitted upon vvthe complementary sleeve 30.

the central-opening or .hole-34 within therotary .body 1U islarger .in diameter than `the 'diameter .of the arbor t0, :and '.hence, zwhen ythe :nut 'Ml is .tightened against the .outermost sleeve `3 the complementary conicalbearing surfaces28a and 26a .coact to "provide [the internal` support for .therotarybody 'Thisis tobe .distinguished from conventional cutter `mounting structures, where-l in the 7rotarybody'is mounted directlyupon :the

peripheral surfacefof fan arbor. .The sleeves .132

are .urged vtoward the body -20 v:so .as to maintain bearing :relationship .between .the vconical surfaces f26b and '28b by means offspring/,washers 36. .A `suitable .spacing .collar T38 als :interposed .35 between the zinner `.Washer and Vthe v'-.arbor sup.-

port |12. lObviouslyyanynumberforsize.;0f collars may `be employed, -gdependinguuponfthe 'length of ythe rotary .bod.yz'.to.be;-supported. l From 'the `foregoing' .description .it `-will be apf 40 parent :that the .rotary r*body '20, 'through the agency of fthe sleeves andy32 fand :the coaction of the surfacesf'thereo'f .with .the complementary surfaces on .the .hubs norjprotuberances 26, is `ac- .curately vmaintained Sin its proper position with respect to :the .arbor .It, irrespective of .the `fact that the apertureorholel34vof .fthe body is considerably larger fthanthe .diameterof the arbor.w

60.2`6a and 28a .might ;b'e excessive, :particularly in l' `connection-with; cutters. of :smaller-sizes. In fact, the `pressure might pbe .great :enough ttol cause Ithe y :shell or :body 20 #to burst. 4".'Ifherfora"lg-provide the second y pairfof sleevesBZ `to `encircle rand grip the outside surface26b iof the y.hubzto counteract the ,pressure .of the .inside icones. Ylxitfleast vone pair .of lsaid cones are .acted uponfby spring. Apressure for clamping purposes. Thisclampingl pressure v serves "to .equalize the pressure when yzthe parts are V*clamped ttogether. .I .have em- :ployed springs such .as :the Lsprings .236 Ihaving La tension correspondingto .about half "the'pres- `sure required `for clamping the ',body `in nplace Tthroughthe agencytofthevinner sleevesll. It

willalso be apparent-.thatlw.employingthe reat -eachextremity thereof.

.It will be noted :that

silient means or dished washers 36, I eliminate the necessity of making both sets of sleeves exactly the same in length.

In IFigure 4, I have shown a member denoted generally by the numeral 22h, which corresponds with the member 22 previously described, with the exception that the member 22h includes a body' 2.0b having an .annular recess [26oprovided The wallsfdisposed on opposite sides of the V-shaped recess 26h serve the same purpose as .the walls on the op- .posite sides of the protuberance 26 previously described. In other words, the invention contemplates the use of annular bearing surfaces vprovided on the body by employing either pro- .tuberances or by recessing vthe end surface of the 'bodyas shown' inFigure 4. Obviously, when .thestructure of .Figure -.4 is employed, the sleeves 30 and 32 `must be correspondingly changed to present complementary bearing surfaces.

In Figure 5 aqniurtherv modificationis 'disclosedwherein amember denoted generallyiby recesses `2li`c provided at-each endthereof. vThe recess 26e might be referred toas agchamfered, area so. as topresent a single bearing surface,A as

distinguished from the oppositely. disposed bear-. ing surfaces presented by `theprotuberances 26 .and :the .recesses-2Gb shown ,in Figure 4.

"From the foregoing description itwill beapparent that `my invention contemplates the provisionfof -a very Vsimple, and practical support.

ing device .for .bodies of revolutiomsuch'as ro- 'tary cutters-and the-like. As stated above, the "diameters of the annularvorl conical` bearing surfaces .may `vary withina given range without effecting thev operativeness .ofthe device.A For example, the diameterof ,the conical'section: presented -by the surfaces v6al beinggreater than shown in thedrawing, As'atisfactorilycooperate with the complementary surfacesl 28alen -the revolution. In other,words,. theaccuracy. with which the concentricity o fthe conical surfaces sleeves 30. ,'However, the conical surfaces must be concentric with the .axis of the body of ,A

on the lbody 2li-are formed will determine the accuracy with ywhich said body, may .be mounted -whenin use. 'My invention precludes the necesv .sity of 'formingv bodies, suclras cutter lbodieshm) lwith :an aperture arrangedtoll accurately fit van larbor of predetermined ,dian,1e,ter.p,A

The invention isA by no vmeans,limited to= .thee

specific arrangementof the keyways andkeys flgand |8,respectively, but c ontemplatesother `arrangements wherein` these parts may .be` wider .than .the structures vshownin the drawing.

In other words, I-.contemp1ate. -using lreysand keyways-in both the arborand rotarylbodyr, which Vare-:equal in width. Obviously, `t h e..-speciiic larf 'rangement of ythe protuberances or hubs 26,. as. Iwell .as the. specific arrangement of thecompley.mentary surfaces which .engage saidhubs may be -1 modified` without.V departing. from"' the spirit and scope of the present. invention; saidv invention.' being limited only by the scopeof the. appended clams. :if

'Having thus v.described my invention, what I` claim .as new and .desire tosecure vby Letters I Patent is:

1. In combination, an arbor adapted to rotate la tool, a tool adaptedto'be rotated by the arbor andhavingan inwardly and an outwardly Slant- :ed conicalbearing surface at .an'end'v thereof and vconcentric with the'tool, a sleeve about and movable'lcingitudimatllyof the' arbor and y having an end surface concentric with the arbor for engaging one of said conical bearing surfaces on the tool, a second sleeve about the first sleeve and having an end surface concentric with the arbor for engaging the other of said conical bearing surfaces on the tool, and means for securing said sleeves in place.

2. In combination, an arbor adapted to rotate a tool, a tool adapted to be rotated by the arbor andhaving an inwardly and an outwardly slanted conical bearing surface at an end thereof and concentric with the tool, a sleeve about and movable longitudinally of the arbor and having an end surface concentric with the arbor for engaging one of said conical bearing surfaces on the tool, a second sleeve about and movable longitudinally of the first sleeve and having an end surface concentric with the arbor for engaging the other of said conical bearing surfaces on the tool, and means for holding the end surfaces of the sleeves against the respective conical surfaces on the tool.

3. In combination. an arbor adapted to rotate a tool. a tool adapted to be rotated by the arbor and having an inwardly and an outwardly slanted conical bearing surface at an end thereof and concentric with the tool, a sleeve about and movable longitudinally of the arbor and having an end surface concentric with the arbor for engaging one of said conical bearing surfaces on the tool, a second sleeve about and movable 1ongitudinally of the first sleeve and having an end surface concentric with the arbor for engaging the other of said conical bearing surfaces on the tool, and means for pressing one sleeve rigidly with. its end surface against one conical surface on the tool and for pressing the other sleeve yieldingly with its end surface against the other conical surface on the tool.

4. In combination, an arbor threaded at one end and adapted to rotate a tool, a tool adapted to be rotated by the arbor and having an inwardly and an outwardly slanted conical, bearing surface at an end thereof and concentric with the tool, a sleeve about and movable longitudinally of the arbor and having an end surface concentric with the arbor for engaging one of said conical bearing surfaces on the tool. and a second sleeve about and movable longitudinally of the rst sleeve and having an end surface concentric with the arbor for engaging the other of said conical bearing surfaces on the tool, a nut on the threaded end of the arbor and adapted to press one sleeve rigidly with its end surface against one of the conical surfaces on the tool, and a spring between the other sleeve and the nut whereby the second sleeve is simultaneously ypressed yieldingly with its end surface against the other conical surface on the tool.

` 5. In combination. an arbor threaded at one end and adapted to rotate a tool, a tool adapted to be rotated by the arbor and having an annular projection at an end thereof, the projection having a conical inner face slanted outwardly and concentric with the tool, and an outer face slanted inwardly and concentric with the tool, a sleeve about and movable longitudinally of the arbor and having an end surface concentric with the arbor for engaging the inner face cf said projcction. a second sleeve about and movable longitudinally of the first sleeve and having an end surface concentric with the arbor and adapted for engaging the outer face of said projection, a nut on the threaded end of the arbor and adapted to press the inner sleeve rigidly with its end surface against the inner conical surface of the projection, and a spring between the outer sleeve and the nut whereby the outer sleeve is simultaneously pressed yieldingly withA its end surface against the outer conical surface of the projection.

CARL G. OLSON. 

